System and method for realtime community information exchange

ABSTRACT

System and method for traffic mapping service are disclosed for allowing plurality of users having each a navigation device to transmit their locations to a server and optionally to signal to the server their requested destination. The system and method are further capable of calculating traffic parameters such as current traffic speed at a given road based on the momentary locations of the users. The system and method of the invention may also calculate and advise the users of preferred roads to take in order to arrive at the requested location with minimum delay.

BACKGROUND OF THE INVENTION

There are known services for traffic reporting, for example, radio traffic reporting and websites which provide such services.

Additionally, there are services which calculate estimated preferred routes, for example, based on pre-calculated stored data, such as, for example, data on traffic lights, average velocities, roads conditions and other suitable data The calculation of the estimated preferred route by these services usually does not take into account the actual current traffic conditions.

BRIEF DESCRIPTION OF THE DRAWINGS

The subject matter regarded as the invention is particularly pointed out and distinctly claimed in the concluding portion of the specification. The invention, however, both as to organization and method of operation, together with objects, features, and advantages thereof, may best be understood by reference to the following detailed description when read with the accompanying drawings in which:

FIG. 1 is a schematic illustration of roads system and members of service for mapping traffic according to one embodiment of the present invention;

FIG. 2 is a schematic illustration of an exemplary system for providing mapping traffic service according to embodiments of the present invention;

FIG. 3 is a schematic illustration of another exemplary system for providing mapping traffic service according to embodiments of the present invention;

FIG. 4 is a flow chart illustrating a method for providing traffic mapping service according to embodiments of the present invention; and

FIG. 5 is a flow chart illustrating a method for providing traffic mapping service according to embodiments of the present invention.

It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, and components have not been described in detail so as not to obscure the present invention.

Embodiments of the present invention may provide a service which may constantly provide a real time updated traffic reports and may calculate preferred routes based on real time data on the traffic conditions.

Embodiments of the present invention may enable traffic mapping and/or reporting, wherein members of the service may transmit their location and other data to a central server. Other data may comprise one or more of type of mobility (e.g. car, motorcycle, bicycle and the like), destinations/origins (e.g., home address, work address and the like), alerts, traffic information, messages and/or any other suitable data. The central server may map all the members and thus, for example, create a traffic map.

The members of the service may be grouped in groups of members, for example, group of members which advance in a same or similar route and/or with the same or similar location and/or destination. A user of the system and method according to embodiments of the invention may be ascribed to a group, for example, of members advancing in the same or similar route and at least the most of them are ahead of him. The user may receive updates from the system on the members of the group, for example, location and/or speed of members of the group and/or other information based on inputs received from the members of the group. The user may further receive updated relevant traffic information, inferred by the system based on actual information received from other members in the same group.

Reference is now made to FIG. 1, which is a schematic illustration of roads system 100 and members 10 a-10 l and 10 x of a service for mapping traffic according to one embodiment of the present invention. Roads system 100 is an exemplary road system and the present invention is not limited to road system 100, its configuration as may be reflected in FIG. 1 or to any other road system. Each of members 10 a-10 k may transmit his/her location to a Real Time Server (RTS) 180. For example, each of members 10 a-10 k may have a navigation device (shown, for example, in FIG. 2) which may be in communication with RTS 180. RTS 180 may receive from the navigation device the location of the member, for example, periodically. For example, member 10 a may be located at location 120 at a specific time and may transmit his/her location to RTS 180. RTS 180 may record the location received from, for example, member 10 a, along with a time stamp indicating the time at which the location of member 10 a was recorded.

Member 10 a may also send its destination to RTS 180, for example, destination 110. Alternatively, RTS 180 may estimate a destination 110 of member 10 a, taking into account, for example, the general direction, current road, historical tracks of member 10 a and/or popular destinations and/or based on other suitable parameters. RTS 180 may automatically define a group of members 10 (confined with square dotted line), for example, which their momentary location may be relevant to on-going calculation of a route for member 10 a from location 120 to destination 110. For example, each of the members in members group 10 may advance in one of several possible routes towards destination 110 and may be located between location 120 of member 10 a and destination 110, for example, members 10 b-10 k. Member 10 a may be defined as a user member 10 a of group 10, which may be grouped according to requirements of member 10 a. Additionally, members of group 10 may be selected by RTS 180 according to, for example, the type of mobility of the member, for example, if the member travels by car, motorcycle, bicycle, by foot, or any other type of transportation. The members of group 10 may be selected, for example, to have similar type of transportation/mobility. Additionally, the members of group 10 may be selected, for example, according to their direction, e.g., in case a member of the service is located in a route between location 120 of user member 10 a and destination 110, but advances in the opposite direction, e.g., from destination 110 to location 120, this member may not be included in group 10. Additionally or alternatively, the membership in a group may be limited to members in a certain distance from the momentary location of the user member 10 a. In some embodiments, user member 10 a may instruct RTS 180 according to which parameters the members of group 10 may be selected, for example, the parameters mentioned above and/or other parameters, such as, for example, the kind of road preferred by user member 10 a, e.g., a broad road, a narrow road, a main road, a highway, a sideway, or any other kind of road. Additionally or alternatively, member 10 a may specify a road, for example, a specific road number, which should be excluded from or included in the route.

Group of members 10 may change with time according to changes in situations of the members, changes in the traffic in which members take part, etc. A member may be added to a group, for example group 10, if his/her respective parameters meet the definitions of the group. A member may be removed from a group, for example group 10, if his/her respective parameters no longer meet the definitions of the group. For example, members may be added to the group 10 if, for example, an additional member enters a route between the location 120 of member 10 a and destination 110 and/or if a member, which was disconnected from RTS 180 for some reason, re-connects to RTS 180 at a certain later moment. For example, member 10 l may enter a route between location 120 and destination 110 from road 112 and then, for example, it may be added to group 10. Members may be subtracted from the group 10 if, for example, a member is no longer located in a route between the location 120 of member 10 a and destination 110, for example, the member departs from the route, or, for example, if a member disconnects from RTS 180 at a certain time. For example, member 10 e may deviate to road 114 and then, for example, may not be located in a route between location 120 and destination 110 and thus, for example, may be subtracted from group 10. In other case member 10 a may by-pass one of the members of group 10 and thus, for example, the by-passed member will no longer be located in a route to destination 110 between user member 10 a and destination 110 and therefore it may be subtracted from group 10.

RTS 180 may receive the locations of the members of group 10, for example, periodically. RTS 180 may create a dynamic traffic map showing the locations of the members of group 10 based on the received locations and the changes in group 10. RTS 180 may also calculate the velocities of the members, for example, based on the changes in the locations between one update to the next one, for example, in case the locations updates are received periodically. Member 10 a may receive from RTS 180 the traffic map, which may be displayed, for example, on a pre-loaded map on a display of, for example, the personal navigation device (shown in FIG. 2). The traffic map may dynamically change and show the location and movement of the members of group 10 and/or the changes in group 10. Each of the members of the service may request from RTS 180 that their location will not be shown to other members.

RTS 180 may receive from the members of the service other traffic data in addition to location data, such as, for example, alerts and/or notifications on traffic jams, long periods of red traffic lights, accidents, blocked lanes, or any other information that may be of assistance for a traveler of that route, for example user member 10 a. RTS 180 may prepare a graphical representation of traffic data which forms a dynamic traffic map that may be displayed to member 10 a with or without geographical map, street map, road map, etc. Based on the dynamic map Member 10 a may decide on a preferred route to reach destination 110. Additionally or alternatively, according to some embodiments of the present invention, RTS 180 may calculate based on the continuously updating location data and optionally on the other traffic data received and/or calculated, a preferred route to reach destination 110, for example, according to one or more characteristic priorities and may notify member 10 a on this route. Member 10 a may request to receive the preferred route from RTS 180. Member 10 a may define for RTS 180 the characteristics of the preferred route, for example, the shortest route, the fastest route, route that passes or not passes in certain roads and/or areas, and/or other preferences of member 10 a.

RTS 180 may recalculate the preferred route, for example, periodically and/or upon request of user member 10 a and/or upon change in the circumstances, for example, changes in traffic conditions, the disclosure of a new road accident which was not included in precious considerations, defective traffic lights, or any other change in the conditions that may have an impact on the decisions of member 10 a regarding selecting a route to go to, for example, destination 110. RTS 180 may notify user member 10 a on the updated preferred route for example, if the update in the preferred route is relevant to member 10 a, for example, periodically and/or upon change in the preferred route. RTS 180 may take into account the current location of member 10 a in order to decide whether the updated preferred route is relevant to member 10 a.

In the example of FIG. 1, member 10 a may reach destination 110 through junction A or through junction B. Junction A may be a junction with traffic light 116. RTS 180 may be notified on traffic light 116 by one or more of the members of group 10, for example, by members 10 k and/or 10 i. Additionally or alternatively, data on traffic lights and/or traffic signs may be stored in RTS 180 and may be integrated by RTS 180 into the traffic map. RTS 180 may receive notifications and/or alerts on other traffic event. For example, RTS 180 may receive a notification if traffic light 116 is out of order. In other example, RTS 180 may receive a notice on a blocked lane at location 118, for example, near junction B. RTS 180 may integrate the received information into the traffic map and/or calculate based on the received information a preferred route to reach destination 110. For example, the blocked lane extending from location 118 and backwards (with respect to the traffic direction) may cause a traffic jam zone 119. RTS 180 may identify traffic jam zone 119 based, for example, on the average velocity of the members located in jam zone 119 or in areas preceding jam zone 119.

Additionally, RTS 180 may enable exchange of messages between members of the service. A message sent by a member may be transmitted, at the choice of said members and/or of RTS 180, to all the members of the service or to one or more groups of members which may be selected, for example, by the sending member and/or by RTS 180, for example, according to the relevance of the information to the members. Alternatively, a member may specify the members of the service to which the message should be sent, namely to each one or by groups or by any other relevant method of definition. The messages may include, for example, traffic information and/or alerts, such as, for example, police speed traps, accidents, special events along the route, and/or any other kind of messages. The Messages may be displayed on the display of the personal navigation device (shown in FIG. 2) or may be presented to the user on any other display or vocally, or any other means of system-user interface.

Additionally, member, such as for example member 10 x, may request from RTS 180 advise or data of a preferred route from a certain starting point to a certain destination, and RTS 180 may calculate a preferred route, for example, based on information received from members of the service in relevant locations as well as based on personal preferences of member 10 x. Member 10 x may request to receive from RTS 180 a preferred route, for example, from location 120 to destination 110. RTS 180 may calculate the preferred route based on, for example, information received from the members of group 10 as described in detail above.

Each of the members of the service, for example, each of members 10 a-10 l, may be a user member, for which RTS 180 may create a group of members as described in detail above, for example, according to a beginning point, for example, a current location of the user member or other beginning point defined by the user member, and a required destination point, for example, defined by the user member. Additionally or alternatively, each of the users may define a group of his own according to, for example, parameters mentioned above and/or other suitable parameters.

Additionally, a member of the service may choose specific members to construct a group, from which he may receive information regarding their location and/or other traffic information and/or other messages, for example, a group of family members and/or friends and/or a work team or any other chosen group of members.

Reference is now made to FIG. 2, which is a schematic illustration of an exemplary system 200 for providing mapping traffic service according to embodiments of the present invention. System 200 may include a plurality of personal navigation devices 210, each of the navigation devices may belong to a member of the mapping traffic service. Personal navigation devices 210 may include, for example, GPS navigation device, mobile phones, Personal Digital Assistants (PDA), Personal Navigation Devices (PND), car PC, mobile computers, or any other suitable device able to include, receive and manipulate and/or operate navigation software. The plurality of personal navigation devices 210 with connectivity capability may be in communication with real time server (RTS) 220, for example, by a cellular network or wireless network or any other mobile communication means. The connection between navigation devices 210 and RTS 220 may be made by any known connection protocol, for example, Transmission Control Protocol (TCP), User Datagram Protocol (UDP), Hypertext Transfer Protocol (HTTP), Wireless Application Protocol (WAP) or any other suitable protocol. Members of the service may send to RTS 220, for example, by personal navigation devices 210, their momentary location and/or speed details for example, periodically for example, as described in detail above with reference to FIG. 1. Additionally, the members may send to RTS 220, for example, by personal navigation devices 210, information on different events, for example, traffic information and/or alerts and/or messages to other members, for example, as described in detail above.

In some embodiments of the present invention, personal navigation device 210 may avoid sending redundant information to RTS 220. Personal navigation device 210 may receive and store parameters such as an average speed in a road, known traffic signs, traffic lights and/or other information. Personal navigation device 210 may avoid from sending information that is already known and/or data which may not add to the known information. This may allow an efficient information communication.

Personal navigation device 210 may automatically send momentary location and/or speed data of the member to RTS 220, for example, periodically, for example by a software included in navigation device 210. The software may be provided and/or installed on navigation device 210, for example, upon registration of the user of navigation device 210 as a member of the traffic mapping service. Other information that may be sent to RTS 220 by navigation device 210 may be entered by the member manually, for example, by keyboard 216 which may be included in navigation device 210 or by calling a service center or by any other suitable kind of communication.

Members of the traffic mapping service may receive, for example, displayable notices on a display 212 and/or vocal notices by a speaker 214, each may be included on navigation device 210. A map may be displayed on display 212, on which locations of members may be displayed. The map may be downloaded and/or installed on navigation device 210. Alternatively, navigation device 210 may receive map data from a tile map server 240, for example, by streaming the map data through a network or in any other suitable manner. Each of the members may request that his location will not be displayed on the map on display 212 of other users. Other traffic information may be received from RTS 220 and displayed on the map, for example, traffic lights location and status, accidents, blocked lanes and other information which may, for example, be received from users of the service and/or may be calculated by the service based on information received from users of the service. As described in detail above, a member may request and receive from RTS 220 a preferred route to reach a desired destination. The preferred route may be displayed on display 212, with or without additional map-associated data such as geographical map, road map, streets map and the like. A member, additionally or alternatively, may receive from RTS 220 vocal navigation instructions by speaker 214. The preferred route may be updated by RTS 220, as described in detail above with reference to FIG. 1, and the updated route may be displayed on the map display 212. An updated traffic map and/or updated route may be calculated periodically and/or upon request of the member or upon a significant change in the road and/or traffic conditions.

Additionally, a member may receive from RTS 220 alerts, information and messages from other members, which may be displayed on display 212 and/or may be notified vocally by speaker 214.

A member of the service may define for RTS 220 the kinds of information and/or alerts he wishes to receive, and then, for example, RTS 220 may transmit to the navigation device of the member information according to the member's preferences.

RTS 220 may calculate for each user member the group of members which may provide information relevant to the user member, for example, according to parameters as described in detail above. The group may dynamically change and may be calculated, for example, periodically and/or upon change in the situation of the group members and/or upon change in the preferences of the user member.

A preferred route may be calculated by a routing server 230. Routing server 230 may receive from RTS 220 traffic information and updates in real time, which may be received by RTS 220 from the members of the service. Additionally, routing server 230 may optionally receive from RTS 220 definitions of preferred routes of user members. Based on the received information and the optional definitions of a preferred route, routing server 230 may calculate and/or send to RTS 220 the preferred route for each user member. Routing server 230 may re-calculate and/or send to RTS 220 updates of the preferred routes, for example, periodically or upon receiving a traffic information update or upon request from RTS 220. It shall be noted that according to embodiments of that two or more of tile map server 240, RTS 220 and routing server 230 may be embodied as units within one device. Additionally, each one of tile map server 240, RTS 220 and routing server 230 may be implemented in hardware, in software or in a combination of them.

Reference is now made to FIG. 3, which is a schematic illustration of another exemplary system 200A for providing mapping traffic service according to embodiments of the present invention. System 200A may include a plurality of personal navigation devices 210, real time server (RTS) 220, routing server 230 and tile map server 240, which may by similar to the same elements included in system 200 and/or function as described with reference to FIG. 2. Additionally, System 200A may include a website 250. Website 250 may be in communication with at least one of personal navigation devices 210 and/or with RTS 220. Information may be uploaded to website 250, for example, by members of the service, for example, through personal navigation devices 210 and/or manually. At least a portion of the uploaded information may be communicated to each of personal navigation device 210 which may be in communication with website 250. The information uploaded to website 250 may be, for example, location information, velocity information, traffic information and/or other information and/or messages and/or alerts uploaded by a user. Website 250 may indicate traffic information and/or other information, messages and/or alerts communicated to website 250 by, for example, RTS 220 and/or a member of the service.

Reference is now made to FIG. 4, which is a flow chart illustrating a method for providing traffic mapping service according to embodiments of the present invention. As shown in block 310, the method may include, for example, receiving information on location and respective time of each of plurality of members. As shown in block 320 the method may include, for example, providing a traffic map based on said locations and said respective times, for example, as described in detail above with reference to FIGS. 1 and 2.

Reference is now made to FIG. 5, which is a flow chart illustrating a method for providing traffic mapping service according to embodiments of the present invention. As shown in block 410, the method may include, for example, receiving a required destination from a member of the service. As shown in block 420 the method may include, for example, creating a group of members including members of the service which share same group definitions, for example, advance in the direction of said destination, for example, as described in detail above with reference to FIGS. 1 and 2. As shown in block 430, the method may include, for example, providing the preferred route to reach the required destination according to location data and/or traffic information received from said group members and/or inferred based on information received from said group members, as described in detail above with reference to FIGS. 1 and 2.

While certain features of the invention have been illustrated and described herein, many modifications, substitutions, changes, and equivalents will now occur to those of ordinary skill in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes as fall within the true spirit of the invention. 

What is claimed is:
 1. A system for a traffic mapping service, the system comprising: a server to wirelessly communicate with a plurality of navigation devices ascribed each to one of a plurality of members of the service, respectively, wherein the server is to receive information on momentary location of each of said members from said plurality of navigation devices, and to provide traffic data on a map based on said momentary locations, wherein the server is to provide to a member of the service a preferred route to arrive at a required destination, based on said momentary location information of said members, wherein the server is to ascribe a member of the service to a particular group of members who are advancing in a same route as said member, wherein a majority of other members of said particular group are ahead of said member.
 2. The system according to claim 1, wherein said server is to calculate said preferred route by taking into account a type of mobility associated with at least one of said members, wherein the type of mobility comprises an indication whether the at least one of said members utilizes a car or a motorcycle.
 3. The system according to claim 1, wherein said server is to receive from said member said required destination, wherein the server is to further provide to said member updated traffic information which is inferred by the server based on actual information received by the server from other members in said particular group.
 4. The system according to claim 1, wherein said server is to estimate said required destination of said member, wherein the server is to limit membership in said particular group to members that (a) advance in a same direction, and (b) are located within a certain distance from a momentary location of said member.
 5. The system according to claim 1, wherein said server (a) to choose said particular group of members from said plurality of members which share one or more same group definitions and (b) to provide said preferred route to arrive at said destination, based on information received from members of said particular group, wherein the server is to change membership in said particular group according to a change in traffic.
 6. The system according to claim 1, wherein the server is to calculate said preferred route according to definitions of preferred route giving by said member, wherein the server is to subtract a certain member from said particular group if said certain member deviates from a route which ends at said required destination.
 7. The system according to claim 1, wherein said preferred route is recalculated periodically by the server and takes into account a traffic jam zone automatically determined by the server based on average velocity of group members in a particular zone.
 8. The system according to claim 1, wherein said preferred route is recalculated upon request of said member, wherein said member is able to request that momentary locations of said member be hidden from other members.
 9. The system according to claim 5, wherein said group definitions are from a list comprising momentary locations relevant to a route to said required destination, type of mobility of the member, direction of travel of the member and distance from said member, wherein the server is (a) to receive a traffic-related message from said member, (b) to receive from said member an indication that the traffic-related message is to be shared with other members, (c) to determine which members are to receive said traffic-related message based on relevance of information in said traffic-related message to said members, and (d) to send the traffic-related message to said members selected based on the relevance of the information.
 10. The system according to claim 5, wherein at least one of said group definitions is defined by the member, wherein the server is to provide traffic information, received from a first member of said particular group, only to one or more other members of said particular group who chose to receive traffic information updates from said first member.
 11. The system according to claim 10, wherein said definitions defined by said member are from a list comprising a type of mobility of the member, direction of travel of the member, distance from said member, and a kind of road being traveled by said member.
 12. The system according to claim 5, wherein said server is to choose said particular group of members according to specification of the members to be included as specified by said member.
 13. The system according to claim 5, wherein said server is to periodically re-calculate which members are to be added to or be subtracted from said particular group of members.
 14. The system according to claim 13, wherein said server is to re-calculate said particular group of members according to at least one of a list comprising one or more changes in situations of said members, one or more changes in traffic, one or more changes in characteristics of members, and one or more changes in definitions of said particular group.
 15. The system according to claim 1, wherein said server is to periodically receive updates on momentary location of each of said members.
 16. The system according to claim 15, wherein said server is to calculate velocities of the members based on changes in locations of the members between one update to a next update.
 17. The system according to claim 1, wherein said server is to provide updates of said traffic data periodically.
 18. The system according to claim 5, wherein said server is (a) to receive alerts and messages from at least one of said plurality of members and (b) to calculate and provide said preferred route also based on said alerts and messages.
 19. A method of providing a traffic mapping service, the method comprising: receiving information on momentary location of each of plurality of members of said service; providing a traffic map based on said locations; providing to a member of the service a preferred route to arrive at a required destination, based on said momentary location information of said members; ascribing a member of the service to a particular group of members who are advancing in a same route as said member, wherein a majority of other members of said particular group are ahead of said member, wherein the method is to be performed by a server comprising at least a hardware component.
 20. The method according to claim 19, further comprising calculating said preferred route by taking into account a type of mobility associated with at least one of said members, wherein the type of mobility comprises an indication whether the at least one of said members utilizes a car or a motorcycle.
 21. The method according to claim 19, further comprising receiving from said member said required destination, and providing to said member updated traffic information which is inferred based on actual information received from other members in said particular group.
 22. The method according to claim 19, further comprising estimating said required destination of said member; and limiting membership in said particular group to members that (a) advance in a same direction, and (b) are located within a certain distance from a momentary location of said member.
 23. The method according to claim 19, further comprising: choosing said particular group of members from said plurality of members which share one or more same group definitions; providing said preferred route based on information received from members of said particular group; and changing membership in said particular group according to a change in traffic.
 24. The method according to claim 19, comprising: calculating said preferred route according to definitions of preferred route given by said member; and subtracting a certain member from said particular group if said certain member deviates from a route which ends at said required destination.
 25. The method of claim 19, further comprising recalculating said preferred route periodically by taking into account a traffic jam zone automatically determined based on average velocity of group members in particular zone.
 26. The method of claim 19, further comprising recalculating said preferred route upon request of said member, wherein said member is able to request that momentary locations of said member be hidden from other members.
 27. The method according to claim 19, wherein said group definitions are from a list comprising momentary locations relevant to a route to said required destination, type of mobility of the member, direction of travel of the member and distance from said member, wherein the method further comprises: receiving a traffic-related message from said member; receiving from said member an indication that the traffic-related message is to be shared with other members; determining which members are to receive said traffic-related message based on relevance of information in said traffic-related message to said members; and sending the traffic-related message to said members selected based on the relevance of the information.
 28. The method of claim 19, wherein at least one of said group definitions is defined by said member, wherein the method comprises providing traffic information, received from a first member of said particular group, only to one or more other members of said particular group who chose to receive traffic information updates from said first member.
 29. The method according to claim 28, wherein said definitions defined by said member are from a list comprising a type of mobility of the member, direction of travel of the member, distance from said member, and a kind of road being traveled by said member.
 30. The method according to claim 23, wherein said choosing comprises: choosing said particular group according to specification of the members by the user members to be included as specified by said member.
 31. The method according to claim 23, further comprising periodically re-calculating which members are to be added to or be subtracted from said particular group of members.
 32. The method according to claim 31, further comprising re-calculating said particular group of members according to at least one of a list comprising one or more changes in situations of said members, one or more changes in traffic, one or more changes in characteristics of members, and one or more changes in definitions of said particular group.
 33. The method according to claim 19, further comprising receiving updates on momentary location of each of said members periodically.
 34. The method according to claim 33, further comprising calculating velocities of the members based on changes in locations of the members between one update to a next update.
 35. The method according to claim 19, further comprising providing updates of said traffic data periodically.
 36. The method according to claim 23, further comprising receiving alerts and/or messages from at least one of said plurality of members and providing said preferred route also based on said alerts and/or messages. 